Ditto. My x61t was a workhorse at University and beyond. I love the the 4:3 aspect ratio. There is something about the extra vertical space that is hard to get across with some people. It's like the freedom felt with tall ceilings.
I was appalled at the state of 16:9 small screen laptops. They just felt claustrophobic doing anything but watching video.
Over time I swapped out the hdd,and upped the ram. User serviceable parts ftw! It served as only computer till 2010 when I finally built a desktop after not being comfortable with other laptop choices. Still served only laptop until finally being replaced with a Surface Pro 3.